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<title>KeyedUpdatableQueue</title>
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<img src="../../../boost.png"  alt="C++ Boost">

<h2><a name="concept:KeyedUpdatableQueue">KeyedUpdatableQueue</a></h2>

<p>A <i>KeyedUpdatableQueue</i> is a refinement of the <a href="./UpdatableQueue.html">UpdatableQueue</a> concept.
It requires that models order the contained values by their <i>keys</i>, to which
values are mapped via a read/write key map.

<h3>Notation</h3>

<table>
<tr> <td> <tt>Q</tt> </td>  <td> is a type that models KeyedUpdatableQueue.       </td></tr>
<tr> <td> <tt>T</tt> </td>  <td> is the value type of <tt>Q</tt>. </td></tr>
</table>


<h3>Members</h3>

For a type to model the KeyedUpdatableQueue concept it must have the following members
in addition to the members that are required of types that model <a href="./UpdatableQueue.html">UpdatableQueue</a>:

<p>

<table border="1">

<tr> <td><b>Member</b></td> <td><b>Description</b></td> </tr>

<tr> <td> <tt>key_type</tt> </td>
     <td> The type of keys that are associated with values </td>
     </tr>

<tr> <td> <tt>key_map</tt> </td>
     <td> The key property map type. This type must model <a href="../../property_map/doc/ReadWritePropertyMap.html">Read/Write Property Map</a>. </td>
     </tr>

<tr> <td> <tt>key_map keys() const</tt> </td>
     <td> Returns the key map </td>
     </tr>

</table>

<h3>Concept Checking Class</h3>

<p><a href="../../../boost/graph/buffer_concepts.hpp"><tt>boost/graph/buffer_concepts.hpp</tt></a>

<pre>
  template &lt;class Q&gt;
  struct KeyedUpdatableQueueConcept
  {
    typedef typename Q::key_type key_type;
    typedef typename Q::key_map key_map;

    void constraints() {
      BOOST_CONCEPT_ASSERT(( UpdatableQueue&lt;Q&gt; ));
      BOOST_CONCEPT_ASSERT(( ReadWritePropertyMap&lt; key_map, typename Buffer&lt;Q&gt;::value_type &gt; ));
    }

    void const_constraints(const Q&amp; cq) {
      km = cq.keys();
      k = get(km, g_ct);
    }

    static const typename Buffer&lt;Q&gt;::value_type g_ct;
    key_type k;
    key_map km;
    Q q;
  };
</pre>

<h3>Models</h3>

<ul>
<li><tt>boost::d_ary_heap_indirect</tt></a>
</ul>

<br>
<hr>
<table>
<tr>
<td>Copyright&nbsp;&copy;&nbsp;2010</td>
<td>Daniel Trebbien (<a href="mailto:dtrebbien@gmail.com">dtrebbien@gmail.com</a>)
</td>
</tr>
</table>

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